Rotary drier



June 16, 193.1. l w. A.V HARTY ET Al. '1,810,476

ROTARY DRIER Filed Dec'. 15, 1928 2 Sheets-Sheet 2 Patented June 16, 1931 g -7-UN1TED s'rArs WILLIAM A. HARTY, oF :BUFFALQNEW YORK, lAnn FRANK w. MOORE.` oFTHoRoLD,

ONTARIO,V CANADA, ASSIGNORS TO HARMOR A CORPORATION OF NEW YORK PATENT oFFicfEl & Co. INC.. or BUFFALO, NEWYORK,

, ROTARY DRIER Application filed December 15, 192.8'. SerialNo. 326,253.

In our present invention we show further improvements upon and refinements over the rotary "drierpatented to us under Reissue N o. `16,265 'granted February 6,1926. D

In general, such improvements involve a more complete utilization of the drying heat to the end. that theeiiiciency of the drier may thereby lbe increased. Y

To this end, our invention consists in the novel construction, combination and relation of parts described and illustrated in thejaccompanying specificationand. drawings and particularly pointed out in the appended claims.

In the drawings n Fig. l is an elevation, partly in section, of a. rotary drier of the type disclosed in our said reissue patent andembodying the features of our present invention.

Fig. 2 is a partial longitudinal section at the exhaust end of the hot core or mandrel.

Fig. 3 is an enlarged cross section on the line 3 3, of Fig. 2.

Fig. 4 is a detail view of the collar shown in Fig. 3and Fig. 5 is a fragmentary section showing a modification.

y As in ourI patenteddrier we provide an external rotary shell land an internal hollow core orhot mandrel 2 which rotates with said shell and preferably extends the full length thereof. For convenience of shipment or replacement of parts, the shell 'and mandrel may be made in sections, the shell sections being provided with circumferential tires 3 running on suitable rollers l carried by supporting bases 5 and 6.

The shell may be rotated from any suitable power source. l/Vhere a base such as the portable bases 5 and 6 is used, the shell is directly driven `from an electric motor M mounted on the base 5 through a sprocket 7, chain 8 and sprocket 9 on one of the shell sections.

yThe mandrel sections are suspended within the shell by means of a'plurality of spring suspension members l0 which .are especially designed to overcome the effects of expansionv and contraction. y

The drier may be heated in any suitable manner as by oil, gas, steam or powdered fuel.

As here lshown it is. heated by means of a" burner nozzle 1l discharging directly into thel firing end of the mandrel. The shellis pro-V vided interiorly thereof with a plurality of lifting flanges` l2 which lift the ymaterial being dried and cascade it on to thehot mandrel.

In order more completely to'utilize the dry- Y These mayrconveniently be constituted by af series of spaced longitudinally kextending hollow ribs 15 welded or otherwise permanently secured to the mandrelitself. In addition to their function as heat conducting passages the hollowA ribs l'serve to keep the material 'in Contact with the hot'mandrel and'to trans# mit the heat into andthrouglrthe material as it travels therealong. f f

' At theexhaust end ofthe-mandr`el,the

a collar '17 which is' slipped endwise over the mandrel andy rotates therewith. The "open-4 ings l'correspond 'in shapef to the'shape of the ribs and the ribs are'fre'ceive'dtherein. By this construction the return heat-deflected by the baflle 13 is positively directed into the channels 14 of the mandrel.

The deiiector'is mounted across the exhaust end of the mandreliin Yany convenient manner, as by providing the drier internal series of. AclipslS.

Wv thusreturnja substantial portionfof the hot gases'dischargingfrom the exhaust` end o-f the mandrel directly along the outer sur face l`of the mandrel itself. In thisl way we secure a concentration of theohotgasesalong the mandrel 'and reduce dissipation of the heat by'y radiation through the shell ofthe shell with an hollow ribs l5 register y.with o]`3e`nin'gs\ 16j in ien . drying chamber defined by the shell and mandrel.

The action of the defiector moreover is to some extent to retard the discharge of the hot gases from the mandrel thus increasing the internal temperature of the mandrel itself by this partial baffling or restriction of the free discharge thereof. K Y z Vhere an evenVV more pronouncedvheat retarding eect is desired, without regard to the heat return feature exteriorly of the mandrel, we may provide the plug 19 (Fig. 5) at` the discharge end of the mandrel. 'This plug" acts to cause a substantial portion of the hot gases to be backed up within the mandrel and thus increase the temperature thereof. Cbviously, however, such retardation may be effected by other' means, as by constricting the discharge end of the-mandrel orb-y providing the mandrel with an internal series of baiiles whichwill retard the discharge of hot gases by compelling them to follow a tortuons'path.

Various modiiications in the operation and construction of our device may obviously be resorted to if within the spirit and scope of our invention without departing from the limits of the appended claims.

lVhat we therefore claiinand desire to se-Y cure by Letters Patent is;

l. Ina heat exchanger, a hot mandrel and a shell spaced therefrom and rotating therewith, having an external series of longitudinally extending return heat channels, and a return heat detlector mounted over the exhaust end of the mandrel in spaced relation thereto for returning a substantial portion of the hot gases discharging from the mandrel intoV and along said return heat channels.

,2. Ina heat exchanger, a hot mandrel and a shell'spaced ytherefrom and rotating there-1 with, havingV an external series of spaced hollow ribs constituting longitudinally extending return heat channels, and a return heat deflector mounted over the exhaust end of the mandrel in spaced relation thereto for returning a substantial portion of the hot gases discharging from theV mandrel into and along said return heat channels.

3. In aV heat exchanger a rotary shell and aL central heating tube extending therethrough and rotating therewith, said tube having an external series of longitudinally extending return heat channels, and a baffle Vplate suspended within the drier over theexhaust end of the tuberandeffective to return a. substantial portion kof the hot gases disthrough and rotating therewith, an externalV seriesof hollow rij-bstonV said tube constituting longitudinally extending return heat channels, and a circular bande plate suspended within the drier over the exhaust end of the tube and effective to return a substantial portion of the hot gases discharging from the tullie into and along said heat return channe s.

5. Ina heat exchanger a rotary shell and la central heating ytube extending therethrough and rotating therewith, a collar sleeved about the exhaust end Yof said tube and having a series of heat passage openings, said tubehaving an external series of longitudinally extending return heat channels registerino' with'said openings of said collar, and a baflie plate suspended within the drier over the exhaust end ofthe tube and effective to return a substantial portion of the hot gases discharging from the tube into and through said heat return channels.

6. In a heat exchanger, a rotary shell and a` central heating tube extending therethrough and rotating therewith, and spaced therefrom, a means interposed in the space between'the shell and the tube and constituting a series of longitudinally extending return heat channels, and a return heat dellector mounted over the exhaust end of said tube in spaced relation thereto for returning a substantial portion of the hot gases discharging from the tube into and along said return heat channels.

In testimony whereof we atlix our signatures.

VILLIAM A. HARTY. FRANK W. MOORE. 

